Skin treatment device



FIG. 1 is a top perspective view of a skin treatment device in accordance with the present design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a back view thereof.

The broken lines shown in the drawings illustrate portions of the skin treatment device that form no part of the claimed design. 

CLAIM The ornamental design for a skin treatment device, as shown and described. 